v0.3.0

• Fix query variable printing for non-null and list types (#203).
• Bumped React dependency to v0.14.0-rc.
• Switched to using ReactDOM rather than React for performing batched updates (via unstable_batchedUpdates).
• Updated the babel-relay-plugin to v0.2.3:
  • Added support for compiling queries containing introspection fields such as __schema, __typename and such.
  • Use of field(before: ..., first: ...) or field(after: ..., last: ...) is now an error.
• Various improvements to documentation, warnings and error messages.